Core bit and plug for drilling



Sept. 13, 1927. w L. ACKER CORE BIT AND PLUG FOR DRILLING Filed July 28 Patented Sept. 13,-19 27.

WILLIAM L. ACKER, OF SCRANTON, PENNSYLVANIA.

CORE BIT AND PLUG FOR DRILLING.

Application filed July as,

The present invent ion relates to drills, and more particularly to that type utilized ior cutting out cores in rock, concrete and the like by the use of steel shot. I

An object of the present invention is to provide a drill of this character, wherein a single shell or wall barrel may be used, and wherein the shot may be led through a head of novel construction together with the required amount of water for feeding the shot to the inner side of the core barrel and retain the shot in the desired position therein.

Another object of the invention s to provide an improved head or plug, which terms a closure for the top of the barrel and which carries a detachable connection for coupling to a, drill rod or other part of a drilling machine used in rotating the head and the barrel ata relatively high rate of speed.

Another object of the invention is to obtain the advantages of insuring the proper feeding of the shot down through the head into the barrel, and which admits of themtroduction of the shot and the water from about the exterior to the head and the drill rod connection, and 'which at the same time maintains the shot from being dislodged incident to the rapid rotationof the head.

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views,

Figure 1 is a vertical section taken centrally through a core barrel and head, showing approximately the location of shot therein and showing in side elevation at connection for use with the head.

Figure 2 is a transverse section taken 011 the line 22 of Figure 1.

Figure 3 is a transverse section taken through the lower part of the core barrel, showing the longitudinal slots in the inner wall of the barrel, and

Figure 4 is an enlarged longitudinal section taken through the connection or nipple used for mounting the barrel head upon the drill rod or the like.

Referring to the drawing, 10 designates a core barrel which is of single thickness and of suitable length, and which is internally threaded at its upper end for the re- 1927. Serial N0. 208,981.

ception of a detachable head 11, which is threaded externally at its lower end and provided with a stop shoulder 12 against which the upper edge of the barrel 10 is adapted to jam for securely mounting the head 11 in the upper end of the barrel.

As shown particularly in Figure 3, the barrel 10 is provided in its inner wall and preferably at opposite sides, with longitu dinally extending grooves or channels 13 of desired width and of substantial depth to receive shot 14 therein, the shot 14 being freely movable downwardly through the channels 13 to the lower edge of the barrel 10. The lower edge of the barrel 10 may be of any suitable configuration best adapted for supporting the shot against the "concrete, rock or other substance which is to be cut, the shape or configuration of the lower edge of the barrel depending upon the nature of the material in which the drill is worked.

The head 11 comprises a cylindrical plug of substantially the diameter of the exterior wall of the barrel l0, and which extends a short way dawn into the barrel and extends a considerable distance above the upper edge of the barrel. The head 11 is provided with an axial opening 15 of relatively large diameter and which opens upwardly into a flaring chamber or hopper 16 into which shot or other suitable cutting material is adapted to be poured.

The hopper 16 opens upwardly and freely through the top of the head 11. The bottom of the hopper 16, which is of substantially inverted cone shape, is provided with a counter-sunk annular groove 17 and the groove 17 opens into the upper part of the axial opening or passage 15, and the latter is internally threaded from the base of the groove 17 downwardly for a substantial distance. For the purpose of supporting the head 11 and barrel 10 upon a drilling rod or other suitable device used for rotating the head and the barrel, a connection is used, such as shown in Figures 1, 2 and at. This connection comprises a hollow stem 18 slightly enlarged at its lower end and externally threaded to form an attaching shank section 19 adapted to be secured into the upper end of the opening 15.

The shank 19 has an outstanding annular flange or collar 20 at its upper end adapted to seat in the groove 17 for jamming the shank in the head 11 and thus firmly connecting the head to the shank. The collar or llange is provided with a plurality of openings in its upper face which lead into radially disposed channels 21 which are inclined downwardly aml opened into the ho]- low axial opening 22 within the stem 18.

The shot from the hopper it; is adapted to roll down through the passages 21 into the opening" 22 and downwardly through the connection into the opening 15 of the head and then to the interior oi the barrel 10. Four passages 21 are shown in the present instance and it is understood that the num: ber may be increased or decrcasetl as is l'ound desirable.

The upper end of the stem 18 is again enlargcd to provide a socket Qiiwhich is internally threaded and adapted to receive the threaded stem portion 24; ol a drilling rod 25 or the like which is connected to the drill ing machine and adapted to be rotated and adjusted for turning the bit and for ra sing; and lowering the same.

In operation, the bit is rotated at high speed and shot and Water are fed into the hopper 16 from any side 01'' the bit tound convenient and the shotby gravity moves downwardly and is permitted to pass in its downward movement through the channels or passages 21 to the interior of the connection. As the shot passes downwardly through the connection and head 11 into the barrel 10, the centrifugal action incident to the high speed of the head and barrel and connection cause the shot to move downwardly against the inner wall of the barrel 10 and to seek the longitudinal channels 13 wherein the shot is entrapped and confined, and permitted to Work downwardly. The shot is thus brought into abrasive contact with the rock, concrete, shale or the like and cuts an annular groove or opening: downwardly Within which the barrel 10 may be fed until the desired depth is obtained. The shot thus cuts out a core from the material which may be removed for the purpose elf testing or the like.

The improved connection admits oi the use oi. a head 11 with a relatively large hopper or receptacle 16 in its top and also provides ample space or room at the top ot the head for the introduction of the shot and water and at the same time atlords a reliable connection between the parts. The provision of this connection between the head and drilling rod also provides a means for admitting of the quick and easy attachment and removal of the drill with respect to the drilling rod.

It is obvious that various changes and modifications may be made in the details of construction and design of the above specifically described embodiment of this invention Without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

What is claimed iS:--

i. In a drill bit, the combination of a single \vall cylimler provided with opposed longitudinal channels in its inner wall, a head mounted on the upper end of the barrel and having an axial opening terminating in an upwardly flaring. hopper opening through the top of the head, and a connect ion detacle ably mounted in the upper end of the head ant adapted l'or mounting upon a drilling; rod, said cotmcetion having an axial open inp; therein communicating with the axial o 'iening ol the head and also provided with downwardly inclined radial passages leading from the bottom of said hopper to the axial opening in the connection.

In a drill bit, a hollow barrel having longit udinal channels in its inner wall, a head mounted on the upper end of the barrel havingr an axial opening leading at its lower end to the interior of the barrel and terminating at its upper end in an upwardly flaring concentric hopper which opens through the top of the head, and a connection carried by the head and secured atits lower end in the axial opening of the head and having inwardly and downwardly inclined passages leading from the bottom of said hopper to the interior of the connection, said connection having means of attachment at its upper end for engagement with a drilling rod.

l. A head for use with core barrels comprising a body portion having an axial openin g therethrough, the upper end ofsaid opening' flaring outwardly through the upper face of the head to provide a hopper for the re ception of shotfor passage through the head, and a connection detachablymounted at its lower end in the axial opening of the head and provided with passages thcret-hrough leading to the interior of the connection from said hopper to conre shot from the hopper to the interior of the connection, said connection having means at its upper end for attachment to a drilling rod.

4-. In a drill bit, the combination of a single wall core barrel having longitudinal slots in its inner side, a head threaded into the upper end of said barrel and having an axial opening therctlnoug'h leading from the interior of the barrel upwardly said axial opening of the head flaring upwardly through the upper face of the head to provide a hopper for the reception of shot, and a connection having an enlarged shank portion detachably threaded in the axial opening of the head and provided with radial down ardly and inwardly inclined passages leadinp; from the bottom of said hopper for conveying shot therefrom to the interior of the connection and to the head. the intermediate portion of said connection being reduced in diameter to accommodate a relatively large quantity of shot in the ho per said connection havlng an enlarged soc eted upper end for detachable engagement with the drilling rod.

p 5. A shot bit comprising a core barrel having a single wall with longitudinal channels in its inner face, a head secured into the upper end of the barrel and having an axial opening leading from the interior of the barrel upwardly, said head having a flaring opening in its upper end leadin to said axial opening for receiving steel 0t for passage downward through the opening in the head and a connection threaded at its lower end into the axial o ening of the head and having passa es lea ing inwardly from the exterior of t e connection to the interior thereof for conveying shot from said enlarged opening through the connection to the interior thereof, said'connection having attachin means at its upper end for receivin a drilling rod.

testimony whereof I aflix my si nature.

WILLIAM L. AC R. 

